fix(schema-compiler): Allow escaping of curly braces in yaml models

[KSDaemon]

Previously it was not possible for example to define a JSON literal in sql property of cube or do similar things.
Now it's fixed!
So you can do for example this in yaml models:

cubes:
  - name: ActiveUsers
    sql: > 
          SELECT 1 as user_id, 
                         '2022-01-01'::TIMESTAMP as timestamp, 
                         CAST('\{"key":"value"\}'::JSON AS TEXT) AS json_col

    dimensions:
      - name: time
        sql: "{CUBE}.timestamp"
        type: time
      - name: json_col
        sql: json_col
        type: string

And if you query it:

{
      dimensions: ['ActiveUsers.time', 'ActiveUsers.json_col'],
}

You'll get an expected result:

      [{
        active_users__time: '2022-01-01T00:00:00.000Z',
        active_users__json_col: '{"key":"value"}',
      }]

This closes #8250

Check List

• Tests have been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.16%. Comparing base (e7901a7) to head (6610b26).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9469      +/-   ##
==========================================
+ Coverage   48.03%   48.16%   +0.13%     
==========================================
  Files         171      171              
  Lines       21449    21454       +5     
  Branches     3723     3724       +1     
==========================================
+ Hits        10303    10334      +31     
+ Misses      10714    10692      -22     
+ Partials      432      428       -4     

Flag	Coverage Δ
cube-backend	48.16% <100.00%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.